Illusion

The Blade Dancer · Feb 28, 2020, 1:38 AM

Hey did you guys know you can customize your profile image, username, and profile banner? Also how do I get reputation?

placidmacaw 0 · Feb 28, 2020, 1:43 AM

You click on your own image and it sends you to your settings

placidmacaw 0 · Feb 28, 2020, 1:47 AM

@po is the illusion called the checker-shadow illusion?

debbie · Feb 28, 2020, 1:51 AM

@placidmacaw-0 Yes, according to Wikipedia!

debbie · Feb 28, 2020, 1:53 AM

@TSS-Graviser I just gave you reputation. Click on the "up" arrow next to the word "Quote"

placidmacaw 0 · Feb 28, 2020, 1:58 AM

@debbie is there going to be a live stream on sunday?

debbie · Feb 28, 2020, 2:05 AM

@placidmacaw-0 It's going to be on Saturday, Feb. 29th, at 2 p.m. (EST Eastern Time) Prof. Loh will do it from his laptop all the way in Romania!

placidmacaw 0 · Feb 28, 2020, 2:09 AM

ok So for me I'm in china, I will have to wake up in the morning to watch it!

debbie · Feb 28, 2020, 2:37 AM

@placidmacaw-0 He's taking the U.S. team to the Romanian Master of Mathematics Competition, which they did not badly at last year!

po · Feb 28, 2020, 7:40 AM

Looking forward to talking to you!

The Blade Dancer · Feb 29, 2020, 12:56 AM

Ooh yay thanks @debbie for the upvote.

RZ923 · Jul 29, 2020, 4:10 AM

@po Thanks for such a cool illusion! I never expected that A and B are the same. It’s amazing how our brain can trick us that much.

divinedolphin · Jul 29, 2020, 1:53 PM

5 months ago: "Thanks for the upvote!"
Now: me: upvotes almost everything lol

amiabletiger · Jul 31, 2020, 3:33 PM

@po yeah, it's a cool illusion, but how do you tell whether the shade of grey is different or not? Is it just a coincidence and you can use some kind of computer program that breaks the color down to a mix of yellow, blue, and red so you can check if it's the same? Or can you calculate the shadiness of B using the intensity of the light and the density and thickness of the cylinder and then make A the same?
Just wanted to know....curiousity...unstoppable...

The Blade Dancer · Jul 31, 2020, 3:36 PM

There's actually a video might be embedded within one of these posts if you put it into a color analyzer they're the same

divinedolphin · Jul 31, 2020, 4:06 PM

If you screenshot square A and square B separately, and copy-paste it into like google docs, you can see that they are actually the same.

amiabletiger · Jul 31, 2020, 4:52 PM

@The-Blade-Dancer @divinedolphin Oh wow, I'll try both ways!

The Blade Dancer · Aug 1, 2020, 5:22 PM

Apparently no embedded video but google search works just as well

RZ923 · Sep 14, 2020, 3:51 AM

A similar illusion:

Bulba_Bulbasaur · Sep 14, 2020, 5:29 AM

nice. -‿-